At work we setup a redundant envirronemnt with two Layer 3 switches connected to two ASA's. The switches have 4 VLAN's each. If SWitch02 is not setup with the VLAN's as interfaces and an IP address, then if Switch01 fails then the servers on the VLAN's will not go out in the IPMAN. When I setup the VLAN's on Switch02 with the same VLAN ip addresses as Switch01 then the servers can get out but obviosuly I get the message of Duplicate VLANs. I have tried seting up Server Client and vtp but that does not work. What is the correct way of dealing with something like this?